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United States Patent | 6,225,718 |
Kamei ,   et al. | May 1, 2001 |
To prevent powder caused by wear of brushes from entering a contact chamber, a first stationary contact is electrically connected to a battery and a second stationary contact is connected to positive brushes, wherein a contact bracket is provided to hold the first stationary contact, and a contact chamber cover is provided to interpose and hold the second stationary contact between the contact chamber cover and the contact bracket so that the contact chamber can be kept in an airtight state.
Inventors: | Kamei; Koichiro (Tokyo, JP); Shiroyama; Shigeru (Tokyo, JP); Kuragaki; Akira (Tokyo, JP); Katayama; Hidekazu (Tokyo, JP) |
Assignee: | Mitsubishi Denki Kabushiki Kaisha (Tokyo, JP) |
Appl. No.: | 453476 |
Filed: | December 2, 1999 |
May 27, 1999[JP] | 11-148162 |
Current U.S. Class: | 310/87; 290/48; 310/71; 310/88; 310/239; 310/249 |
Intern'l Class: | H02K 005/10; H02K 011/00; H01R 039/38; H01R 039/36; F02N 011/08 |
Field of Search: | 310/85,86,87,88,89,71,67 R,238,239,248,249 290/48,38 A,38 B |
5065039 | Nov., 1991 | Isozumi et al. | 290/48. |
5877575 | Mar., 1999 | Nara et al. | 310/239. |
6157105 | Dec., 2000 | Kuragaki et al. | 310/75. |
Foreign Patent Documents | |||
7-87682 | Sep., 1996 | JP. | |
8-319926 | Dec., 1996 | JP. | |
10-266933 | Oct., 1998 | JP. |